题解 | #获得月份天数#

Switch case语句好理解

#include <stdio.h>

int main(){
    int year,month;
    while(~scanf("%d %d",&year,&month)){
        switch(month){
            case 1:printf("31\n"); break;
            case 2:if ((year%4==0&&year%100!=0)||year%400==0)printf("29\n");else printf("28\n"); break;
            case 3:printf("31\n"); break;
            case 4:printf("30\n"); break;
            case 5:printf("31\n"); break;
            case 6:printf("30\n"); break;
            case 7:printf("31\n"); break;
            case 8:printf("31\n"); break;
            case 9:printf("30\n"); break;
            case 10:printf("31\n"); break;
            case 11:printf("30\n"); break;
            case 12:printf("31\n"); break;
        }
    }
    return 0;
}